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Forgot to mention: make sure to get UPS which doesn't beep or which you can turn beeping off when voltage dips -- also not good during show.

As people have said, it was probably power problems -- I think low voltage moments caused by lighting. You said the opening band went fine, but if there were lighting changes, the current drawn by lighting could vary a lot. If you talk to whoever was running the lighting board, they might be able to...